Ignore tcp errors during close request to eldap

If underlying tcp connection is closed and LDAP operation returned tcp error,
then client applications tend to close ldap handle with eldap:close.
This will cause do_unbind to throw gen_tcp_error, which is unhandled
and will be sent to linked process as {nocatch, {gen_tcp_error, ...}}.
eldap should ignore gen_tcp_error during close, because it will be closing anyway.

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/eldap/src/eldap.erl b/lib/eldap/src/eldap.erl
index dc236f8a44..8994df10eb 100644
--- a/lib/eldap/src/eldap.erl
+++ b/lib/eldap/src/eldap.erl
@@ -564,7 +564,12 @@ loop(Cpid, Data) ->
             ?MODULE:loop(Cpid, NewData);
 
 	{_From, close} ->
-	    {no_reply,_NewData} = do_unbind(Data),
+        % Ignore tcp error if connection is already closed.
+        try do_unbind(Data) of
+            {no_reply,_NewData} -> ok
+        catch
+            throw:{gen_tcp_error, _TcpErr} -> ok
+        end,
 	    unlink(Cpid),
 	    exit(closed);